package com.abc.cloud.websocket;

import java.time.LocalDateTime;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.date.DateUtil;
import cn.hutool.json.JSONUtil;
import com.abc.cloud.dto.im.ChatDetail;
import com.abc.cloud.entity.ChatDetailEntity;
import com.abc.cloud.entity.ChatDetailUserEntity;
import com.abc.cloud.service.ChatDetailService;
import com.abc.cloud.service.ChatDetailUserService;
import com.abc.cloud.service.ChatService;
import com.abc.cloud.service.ChatUserService;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;
import org.springframework.transaction.annotation.Transactional;

/**
 * 聊天
 */
@Component
@Slf4j
@ServerEndpoint("/chat/{chatId}/{userId}")
public class ChatWebSocket {

    public static ChatUserService chatUserService;
    public static ChatService chatService;
    public static ChatDetailService chatDetailService;
    public static ChatDetailUserService chatDetailUserService;

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    private String userId;

    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    private static CopyOnWriteArraySet<ChatWebSocket> chatWebSockets = new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<String, Session>();

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            chatWebSockets.add(this);
            sessionPool.put(userId, session);
            log.info("【websocket消息】有新的连接，总数为:" + chatWebSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            chatWebSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】连接断开，总数为:" + chatWebSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param messageObj
     */
    @OnMessage
    public void onMessage(String messageObj) {
        log.info("【websocket消息】收到客户端消息:" + messageObj);

        ChatDetail chatDetail = JSONUtil.toBean(messageObj, ChatDetail.class);
        chatDetail.setCreateTime(DateUtil.format(new Date(), "yyyy-MM-dd HH:mm:ss"));

        if (chatDetail.getType() == 1) {
            // 私聊
            Boolean flag1 = sendOneMessage(chatDetail.getFromUserId(), chatDetail);
            Boolean flag2 = sendOneMessage(chatDetail.getToUserId(), chatDetail);

            // 保存消息记录
            ChatDetailEntity chatDetailEntity = getChatDetail(chatDetail);
            chatDetailService.saveChatDetail(chatDetailEntity);

            // 处理用户未读消息和已读消息
            opMessageRead(chatDetail.getFromUserId(), flag1, chatDetailEntity.getId(), chatDetail.getChatId());
            opMessageRead(chatDetail.getToUserId(), flag2, chatDetailEntity.getId(), chatDetail.getChatId());

        } else if (chatDetail.getType() == 2) {
            // 群聊
//            List<ChatUserEntity> list = chatUserService.list(new QueryWrapper<ChatUserEntity>().eq("chat_id", message.getChatId()).eq("status", 1));
//            sendMoreMessage(list, message);
        }

        // 修改聊天列表为最后一条消息
        String content = chatDetail.getContent() == null ? "[文件]" : chatDetail.getContent();
        chatService.updateLastMessage(chatDetail.getChatId(), content);

    }

    /**
     * 处理用户未读消息和已读消息
     * @param userId
     * @param flag
     * @param chatDetailId
     */
    private void opMessageRead(Long userId, Boolean flag, Long chatDetailId, Long chatId) {
        ChatDetailUserEntity chatDetailUserEntity;
        if (flag){
            // 保存聊天该成员已读
            chatDetailUserEntity = getChatDetailUser(chatDetailId, userId, 1);
        }
        else{
            // 聊天成员未读消息+1
            chatUserService.increaseUnreadCount(chatId, userId);

            // 保存聊天该成员未读
            chatDetailUserEntity = getChatDetailUser(chatDetailId, userId, 2);
        }
        chatDetailUserService.save(chatDetailUserEntity);
    }

    /**
     * 发送错误时的处理
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:" + error.getMessage());
        error.printStackTrace();
    }


    // 此为广播消息
    public void sendAllMessage(String message) {
        log.info("【websocket消息】广播消息:" + message);
        for (ChatWebSocket chatWebSocket : chatWebSockets) {
            try {
                if (chatWebSocket.session.isOpen()) {
                    chatWebSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public Boolean sendOneMessage(Long userId, ChatDetail chatDetail) {
        Session session = sessionPool.get(String.valueOf(userId));
        if (session != null) {
            if (session.isOpen()) {
                try {
                    String msg = JSONUtil.toJsonStr(chatDetail);
                    log.info("【websocket消息】 单点消息:" + msg);
                    // 发送消息
                    session.getAsyncRemote().sendText(msg);
                    return true;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            else  return false;
        }
        else return false;
        return true;
    }

    /**
     * 获取ChatDetailUserEntity对象
     * @param chatDetailId
     * @param userId
     * @param isRead
     * @return
     */
    private ChatDetailUserEntity getChatDetailUser(Long chatDetailId, Long userId, Integer isRead) {
        ChatDetailUserEntity chatDetailUserEntity = new ChatDetailUserEntity();
        chatDetailUserEntity.setChatDetailId(chatDetailId);
        chatDetailUserEntity.setUserId(userId);
        chatDetailUserEntity.setIsRead(isRead);
        return chatDetailUserEntity;
    }

//    // 此为单点消息(多人)
//    public void sendMoreMessage(List<ChatUserEntity> userList, Message message) {
//        String msg = JSONUtil.toJsonStr(message);
//    	for(ChatUserEntity chatUser: userList) {
//    		Session session = sessionPool.get(String.valueOf(chatUser.getUserId()));
//            if (session != null && session.isOpen()) {
//                try {
//                	log.info("【websocket消息】 单点消息（多人）:" + msg);
//                    session.getAsyncRemote().sendText(msg);
//                } catch (Exception e) {
//                    e.printStackTrace();
//                }
//            }
//    	}
//    }


    /**
     * 获取ChatDetailEntity实体类
     *
     * @param chatDetail
     * @return
     */
    private ChatDetailEntity getChatDetail(ChatDetail chatDetail) {
        ChatDetailEntity chatDetailEntity = new ChatDetailEntity();
        Date date = new Date();
        chatDetailEntity.setFromUserId(chatDetail.getFromUserId());
        chatDetailEntity.setChatId(chatDetail.getChatId());
        chatDetailEntity.setContent(chatDetail.getContent() == null ? "[文件]" : chatDetail.getContent());
        chatDetailEntity.setToUserId(chatDetail.getToUserId());
        chatDetailEntity.setType(chatDetail.getType());
        chatDetailEntity.setCreateTime(date);
        chatDetailEntity.setUpdateTime(date);
        chatDetailEntity.setStatus(1);
        chatDetailEntity.setFromAvatar(chatDetail.getFromAvatar());
        chatDetailEntity.setFromUsername(chatDetail.getFromUsername());
        chatDetailEntity.setFromNickname(chatDetail.getFromNickname());
        chatDetailEntity.setToAvatar(chatDetail.getToAvatar());
        chatDetailEntity.setToUsername(chatDetail.getToUsername());
        chatDetailEntity.setToNickname(chatDetail.getToNickname());
        chatDetailEntity.setFileList(JSONUtil.toJsonStr(chatDetail.getFileList()));
        return chatDetailEntity;
    }


}
